共 52 条
Broadband electromagnetic wave absorption of Ni0.5Zn0.5Nd0.04Fe1.96O4 ferrites modified by nano-silver particles
被引:9
作者:
Zhou, Jintang
[1
,2
]
Wei, Bo
[1
]
Qian, Kun
[1
]
Yao, Zhengjun
[1
]
Chen, Ping
[3
]
Tan, Ruiyang
[1
]
Yi, Pengshu
[1
]
Jin, Liqiang
[1
]
Wang, Mengqing
[1
]
机构:
[1] Nanjing Univ Aeronaut & Astronaut, Coll Mat & Technol, Nanjing 211100, Peoples R China
[2] Nanjing Univ Aeronaut & Astronaut, Key Lab Mat Preparat & Protect Harsh Environm, Minist Ind & Informat Technol, Nanjing 211100, Peoples R China
[3] Nanjing Univ, Sch Elect Sci & Engn, Nanjing 210023, Peoples R China
基金:
中国国家自然科学基金;
关键词:
Nano silver;
Conductor;
semiconductor;
Ferrite;
Electromagnetic properties;
Wave absorbing properties;
MICROWAVE-ABSORPTION;
MAGNETIC-PROPERTIES;
CO0.2NI0.4ZN0.4FE2O4;
FERRITE;
HOLLOW MICROSPHERES;
NICKEL FERRITE;
NANOCOMPOSITES;
PERMEABILITY;
SUBSTITUTION;
ENHANCEMENT;
TEMPERATURE;
D O I:
10.1016/j.ceramint.2022.10.171
中图分类号:
TQ174 [陶瓷工业];
TB3 [工程材料学];
学科分类号:
0805 ;
080502 ;
摘要:
Ferrite materials have the potential to become excellent absorbing materials due to their high magnetic loss and good impedance matching. However, the disadvantages of high density and lack of dielectric loss capability limit its application. Herein, we used the citric acid sol-gel method and the self-propagating combustion method to prepare neodymium-doped nickel-zinc ferrite (NZNF), then the target effect of Sn2+ and an improved electroless silver plating process was used to plate a layer composed of silver nanoparticles (Ag NPs) with strong dielectric loss on the NZNF, and a magnetic/dielectric composite material (NZNF@Ag) with a heterogeneous structure was prepared. The number and particle size of Ag NPs on the surface of NZNF can be precisely controlled, thereby greatly enhancing the dielectric loss capability with little impact on the magnetic loss. The huge difference in conductivity between conductors and semiconductors promotes the occurrence of polarization at the hetero-geneous interface and significantly enhances the electromagnetic wave absorption ability of the composite material. In the 2-18 GHz frequency band, the best sample can obtain an effective bandwidth of 6.82 GHz when the matching thickness is 2.1 mm. Combining conductors with semiconductor materials to obtain significantly enhanced interfacial polarization provides a new idea for improving the performance of wave absorbing materials.
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页码:6351 / 6360
页数:10
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